Dr. Hofmann o)i the Metamorphoses of Indigo. 399 

 Phosphate of Chloranilme. 



A solution of the base in alcohol forms, with phosphoric 

 acid, a thick mass of crystalline plates, which are tolerably 

 soluble in alcohol and water. I have not made any further 

 investigation of this salt. 



Hydrochlorate of Chloranilme^ CI H, Q>i<i< q^ >-N. 



Forms large, colourless, transparent crystals, which are ob- 

 tained on cooling from a hot saturated solution of the base in 

 hydrochloric acid. By redissolving in water and slowly eva- 

 porating the dilute solution over sulphuric acid, large well- 

 formed crystals are produced. In describing the correspond- 

 ing bromine compound I shall speak more of their crystalline 

 form. They remain unchanged on exposure to the air, but 

 become white and opake by the application of heat. If the 

 heat be carefully applied they can be sublimed in a tube like 

 sal-ammoniac; by sudden elevation of the temperature, how- 

 ever, the salt is decomposed with evolution of a violet-blue 

 vapour. 



The analysis of the crystals, dried at the temperature of the 

 air, gave the following results: — 0'3155 grm. of the salt pre- 

 cipitated with nitrate of silver gave 0'271 grm. of chloride of 

 silver, corresponding to 22' 10 per cent, of hydrochloric acid, 



which leads to the formula CI H, C-^ci< r^^ />N. 



Theory. Experiment. 



f K. J 



1 eq. Chloraniline . .= 1594-69 77*80 7790 



1 eq. Hydrochloric acid = 455-15 2 2-20 22-10 



1 eq. Hydrochlorate 1 2049^ 1^0^ 100^ 

 ot chloranilme . j 



Chloraniline and Bichloride of Platinum. 



cih,c,2|^«|n+ Cl,Pt. 



A solution of chloraniline in hydrochloric acid is precipi- 

 tated of an orange-yellow colour by bichloride of platinum. 

 If the two solutions are mixed hot, the whole fluid on cooling 

 becomes a mass of crystalline plates. This double salt is 

 very soluble in water, spirits of wine, and even in a mix- 

 ture of alcohol and aether. To obtain it pure it is to be 

 washed with cold water till the fluid, which continues to pos- 

 sess an evident acid reaction, passes colourless. On ex- 

 posing the moist salt to the light, it becomes of a violet colour 

 on the surface, which arises probably from the oxidizing ac- 



